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k in (-oo:+oo)
(1/2)*k-k-(1/5) = (1/10)*(k+5) // - (1/10)*(k+5)
(1/2)*k-((1/10)*(k+5))-k-(1/5) = 0
(-1/10)*(k+5)+(1/2)*k-k-1/5 = 0
k/2-1/10*(k+5)-k-1/5 = 0
(-1/10*2*5*(k+5))/(2*5)+(5*k)/(2*5)+(2*5*(-k))/(2*5)+(-1*2)/(2*5) = 0
5*k-1/10*2*5*(k+5)+2*5*(-k)-1*2 = 0
4*k-10*k-5-2 = 0
-6*k-5-2 = 0
-6*k-7 = 0
(-6*k-7)/(2*5) = 0
(-6*k-7)/(2*5) = 0 // * 2*5
-6*k-7 = 0
-6*k-7 = 0 // + 7
-6*k = 7 // : -6
k = 7/(-6)
k = -7/6
k = -7/6
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